A century ago, we imagined futuristic cities full of hulking, steel buildings, their towers…
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Over at The World Geography, there is a fantastic collection of "incredible drives above the trees," and these are just a small sampling of the images they've collected. Above, you can see highway H-3 in Hawaii. In the future, cities might look like an enormous green mountain, and these roadways might be leading straight to downtown.

This is today's Europa Brücke, in Austria. Beneath it, you can imagine the roofs of a city powered entirely by sunlight — and by solar cells made partly from living trees.

Brazil's Rodovia is one of the most incredible elevated highways to wind its way over the forest. But what if those hills were actually covered in bacterial mats doing water purification for São Paulo? Those trees might shelter homes, or they might be homes. The roadway could be connecting the city to its energy source, or connecting one forest city with another.

This is the Denny Creek viaduct in the state of Washington in the U.S. It's the view that we might have one day from the busy streets of our living metropolises, connected by massive viaducts that guide our shared vehicles from one high-density area to another.